Strange as I was able to get two 7970's in Crossfire to work (but not three). What drivers are you using?
When you say 5870/5850 Crossfire are you talking about Crossfire with those two cards together, or are you talking about two 5870's or two 5850's in Crossfire?

Strange as I was able to get two 7970's in Crossfire to work (but not three). What drivers are you using?
When you say 5870/5850 Crossfire are you talking about Crossfire with those two cards together, or are you talking about two 5870's or two 5850's in Crossfire?

Click to expand...

5870 with 5850 together.
I had the same problem in 3D Mark until they (AMD) released the latest beta drivers. Maybe they need to release another for this also??